JP5470881B2 - Measuring apparatus and measuring method - Google Patents

Measuring apparatus and measuring method Download PDF

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JP5470881B2
JP5470881B2 JP2009026334A JP2009026334A JP5470881B2 JP 5470881 B2 JP5470881 B2 JP 5470881B2 JP 2009026334 A JP2009026334 A JP 2009026334A JP 2009026334 A JP2009026334 A JP 2009026334A JP 5470881 B2 JP5470881 B2 JP 5470881B2
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貴記 岩脇
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Seiko Epson Corp
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本発明は、光を用いて測定を行う技術に関する。   The present invention relates to a technique for performing measurement using light.

測定用の光を出力する光源から光を生体に照射し、生体中の血液で反射された光を受光素子で検出して血中酸素飽和度を測定する装置（例えば、特許文献１参照）や、生体中の血液で反射された光を受光素子で検出して脈波を測定する装置（例えば、特許文献２参照）がある。これらの装置によれば、生体で反射した光を検知するだけで生体の測定を行えるため、生体に非接触で生体を傷つけることなく測定を行うことができる。   An apparatus for measuring blood oxygen saturation by irradiating a living body with light from a light source that outputs measurement light and detecting light reflected by blood in the living body with a light receiving element (for example, see Patent Document 1) There is an apparatus for measuring a pulse wave by detecting light reflected by blood in a living body with a light receiving element (see, for example, Patent Document 2). According to these devices, since the living body can be measured only by detecting the light reflected by the living body, the measurement can be performed without damaging the living body without contact with the living body.

特開昭６３−９２３３５号公報JP-A-63-92335 特開２００６−２７１８９６号公報JP 2006-271896 A

ところで、生体に光を照射して測定を行う場合、例えば、光源以外の照明器具から出力されて生体で反射した光や生体を透過した光など、測定用の光ではない光も生体に到達しうる。受光素子において測定用の光ではない光が検知されると、受光素子から出力される信号には測定用の光ではない光の成分も含まれることとなり、精度の良い測定が難しくなる。   By the way, when performing measurement by irradiating a living body with light, for example, light that is not measurement light such as light output from a lighting device other than the light source and reflected by the living body or transmitted through the living body reaches the living body. sell. When light that is not measurement light is detected in the light receiving element, a signal output from the light receiving element includes a component of light that is not measurement light, and accurate measurement becomes difficult.

本発明は、上述した背景の下になされたものであり、測定用の光以外の光を受光しても精度良く測定を行える技術を提供することを目的とする。   The present invention has been made under the above-described background, and an object of the present invention is to provide a technique capable of measuring accurately even when light other than measurement light is received.

本発明に係る測定装置は、予め定められた波長の光を透過する濾光手段と、被測定体に光を出力する光出力手段と、前記光出力手段から出力されて前記被測定体を透過した後に前記濾光手段を透過した測定光と、前記被測定体を透過した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第１受光手段と、前記光出力手段から出力されて前記被測定体を透過した後に前記濾光手段を透過した散乱光と、前記被測定体を透過した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第２受光手段と、前記光出力手段、および前記第１受光手段を制御する制御手段と、前記第１受光手段から出力された信号と前記第２受光手段から出力された信号の差分の信号を得る差分抽出手段と、前記光出力手段から光が出力されないように前記制御手段が前記光制御手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第１信号を記憶部に記憶させ、前記光出力手段から光が出力されるように前記制御手段が前記光制御手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第２信号を前記記憶部に記憶させ、前記記憶部に記憶された第１信号と第２信号の差分を表す第３信号を前記記憶部に記憶させる記憶部制御手段と、前記光出力手段から光が出力されるように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答するように前記制御手段に制御された時に前記差分抽出手段で得られる信号を、前記記憶部に記憶された第３信号で補正する補正手段と、前記補正手段で補正された信号から前記被測定体の情報を生成する情報生成手段とを有する。
本発明によれば、外来光や散乱光の影響を受けず、精度良く測定を行うことができる。 A measuring apparatus according to the present invention includes a filtering unit that transmits light of a predetermined wavelength, a light output unit that outputs light to a measurement object, and a light output from the light output unit that passes through the measurement target. A first light receiving means for receiving measurement light that has passed through the filtering means and extraneous light that has passed through the measured object and then passed through the filtering means, and outputs a signal corresponding to the received light; The scattered light transmitted from the light output means and transmitted through the device to be measured and then transmitted through the filtering device and the extraneous light transmitted through the device to be measured and then transmitted through the filtering device are received, Second light receiving means for outputting a signal corresponding to the received light, control means for controlling the light output means and the first light receiving means, a signal output from the first light receiving means and the second light receiving means Difference extraction means for obtaining a difference signal of the signals output from Obtained by the difference extraction means when the control means controls the light control means so that no light is output from the light output means, and the first light receiving means is controlled by the control means so as not to respond to light. The first signal is stored in the storage unit, the control means controls the light control means so that light is output from the light output means, and the control means prevents the first light receiving means from responding to light. When controlled, the second signal obtained by the difference extraction means is stored in the storage unit, and the third signal representing the difference between the first signal and the second signal stored in the storage unit is stored in the storage unit. When the control unit controls the light output unit so that light is output from the storage unit control unit and the light output unit, and the first light receiving unit is controlled by the control unit to respond to the light. Obtained by the difference extraction means Signal, the has a correction means for correcting the third signal stored in the storage unit, and an information generation unit for generating information of the object to be measured from the corrected signal with said correction means.
According to the present invention, measurement can be performed with high accuracy without being affected by external light or scattered light.

また、本発明に係る測定装置は、予め定められた波長の光を透過する濾光手段と、被測定体に光を出力する光出力手段と、前記光出力手段から出力されて前記被測定体で反射した後に前記濾光手段を透過した測定光と、前記被測定体で反射した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第１受光手段と、前記光出力手段から出力されて前記被測定体で反射した後に前記濾光手段を透過した散乱光と、前記被測定体で反射した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第２受光手段と、前記光出力手段、および前記第１受光手段を制御する制御手段と、前記第１受光手段から出力された信号と前記第２受光手段から出力された信号の差分の信号を得る差分抽出手段と、前記光出力手段から光が出力されないように前記制御手段が前記光制御手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第１信号を記憶部に記憶させ、前記光出力手段から光が出力されるように前記制御手段が前記光制御手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第２信号を前記記憶部に記憶させ、前記記憶部に記憶された第１信号と第２信号の差分を表す第３信号を前記記憶部に記憶させる記憶部制御手段と、前記光出力手段から光が出力されるように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答するように前記制御手段に制御された時に前記差分抽出手段で得られる信号を、前記記憶部に記憶された第３信号で補正する補正手段と、前記補正手段で補正された信号から前記被測定体の情報を生成する情報生成手段とを有する。
本発明によれば、外来光や散乱光の影響を受けず、精度良く測定を行うことができる。 The measuring apparatus according to the present invention includes a filtering unit that transmits light having a predetermined wavelength, a light output unit that outputs light to the measurement object, and the measurement object output from the light output unit. A first light receiving unit that receives the measurement light that has been reflected by the filtering unit and then transmitted through the filtering unit, and the extraneous light that has been reflected by the measured object and then has passed through the filtering unit, and outputs a signal corresponding to the received light. And scattered light that has been output from the light output means and reflected by the measured object and then transmitted through the filtering means, and extraneous light that has been reflected by the measured object and then transmitted through the filtering means. The second light receiving means for outputting a signal corresponding to the received light, the light output means, the control means for controlling the first light receiving means, the signal output from the first light receiving means, and the second Difference extraction to obtain the difference signal of the signals output from the light receiving means And the difference extraction means when the control means controls the light control means so that light is not output from the light output means, and the control means is controlled so that the first light receiving means does not respond to light. The control unit controls the light control unit so that light is output from the light output unit, and the first light receiving unit does not respond to light. The second signal obtained by the difference extraction unit when controlled by the control unit is stored in the storage unit, and a third signal representing the difference between the first signal and the second signal stored in the storage unit is stored in the storage unit. Storage unit control means for storing the light, and the control means controls the light output means so that light is output from the light output means, and the control means controls the first light receiving means to respond to light. When the difference extraction means The signal is, the has a correction means for correcting the third signal stored in the storage unit, and an information generation unit for generating information of the object to be measured from the corrected signal with said correction means.
According to the present invention, measurement can be performed with high accuracy without being affected by external light or scattered light.

本発明において、前記濾光手段と同じ波長の光を透過する第２濾光手段を有し、前記光出力手段から出力されて前記第２濾光手段を透過した光が前記被測定体に照射されてもよい。
この構成によれば、単一の波長の光が受光されるので、精度良く測定を行うことができる。 In the present invention, there is provided second filtering means that transmits light having the same wavelength as that of the filtering means, and the light output from the light output means and transmitted through the second filtering means is applied to the object to be measured. May be.
According to this configuration, since light having a single wavelength is received, measurement can be performed with high accuracy.

また、本発明において、前記光出力手段から出力される光は、複数の波長の光を含んでいてもよい。
この構成によれば、生体に照射されて生体で反射される光の波長を変化させることが可能であり、生体に応じて生体に照射する光の波長を選択できる。 In the present invention, the light output from the light output means may include light having a plurality of wavelengths.
According to this configuration, it is possible to change the wavelength of light that is irradiated to the living body and reflected by the living body, and the wavelength of light that is irradiated to the living body can be selected according to the living body.

本発明に係る測定方法は、予め定められた波長の光を透過する濾光ステップと、
被測定体に光を出力する光出力ステップと、
前記光出力ステップから出力されて前記被測定体を透過した後に前記濾光ステップを透過した測定光と、前記被測定体を透過した後に前記濾光ステップを透過した外来光とを受光し、受光した光に応じた信号を出力する第１受光ステップと、
前記光出力ステップから出力されて前記被測定体を透過した後に前記濾光ステップを透過した散乱光と、前記被測定体を透過した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第２受光ステップと、
前記光出力ステップ、および前記第１受光ステップを制御する制御ステップと、
前記第１受光ステップから出力された信号と前記第２受光ステップから出力された信号の差分の信号を得る差分抽出ステップと、
前記光出力ステップから光が出力されないように前記制御ステップが前記光出力手段を制御し、前記第１受光ステップが光に応答しないように前記制御ステップに制御された時に前記差分抽出ステップで得られる第１信号を記憶部に記憶させ、
前記光出力ステップから光が出力されるように前記制御ステップが前記光出力ステップを制御し、前記第１受光ステップが光に応答しないように前記制御ステップに制御された時に前記差分抽出ステップで得られる第２信号を前記記憶部に記憶させ、
前記第１信号と前記第２信号の差分を表す第３信号を前記記憶部に記憶させる記憶制御ステップと、
前記光出力ステップから光が出力されるように前記制御ステップが前記光出力ステップを制御し、前記第１受光ステップが光に応答するように前記制御ステップに制御された時に前記差分抽出ステップで得られる信号を、前記記憶制御ステップに記憶された第３信号で補正する補正ステップと、
前記補正ステップで補正された信号から前記被測定体の情報を生成する情報生成ステップとを有する、
本発明によれば、外来光や散乱光の影響を受けず、制度良く測定を行うことができる。 The measuring method according to the present invention includes a filtering step for transmitting light of a predetermined wavelength,
A light output step for outputting light to the object to be measured;
Receiving the measurement light output from the light output step and transmitted through the measured object after passing through the measured object; and extraneous light transmitted through the measured object and then transmitted through the filtered step. A first light receiving step for outputting a signal in accordance with the emitted light;
Receiving scattered light that has been output from the light output step and transmitted through the measured object after passing through the measured object, and extraneous light that has been transmitted through the measured object and then transmitted through the filtering means. A second light receiving step for outputting a signal in accordance with the emitted light;
A control step for controlling the light output step and the first light receiving step;
A difference extraction step for obtaining a difference signal between the signal output from the first light receiving step and the signal output from the second light receiving step;
Obtained in the difference extraction step when the control step controls the light output means so that no light is output from the light output step, and when the control step is controlled so that the first light receiving step does not respond to light. Storing the first signal in the storage unit;
Obtained in the difference extraction step when the control step controls the light output step so that light is output from the light output step, and when the control step is controlled so that the first light receiving step does not respond to light. The second signal to be stored in the storage unit,
A storage control step of storing a third signal representing a difference between the first signal and the second signal in the storage unit;
Obtained in the difference extraction step when the control step controls the light output step so that light is output from the light output step, and when the first light receiving step is controlled by the control step to respond to light. A correction step of correcting the received signal with the third signal stored in the storage control step;
An information generation step of generating information on the measured object from the signal corrected in the correction step,
According to the present invention, it is possible to perform measurement systematically without being influenced by external light or scattered light.

予め定められた波長の光を透過する濾光ステップと、
被測定体に光を出力する光出力ステップと、
前記光出力ステップから出力されて前記被測定体で反射した後に前記濾光ステップを透過した測定光と、前記被測定体で反射した後に前記濾光ステップを透過した外来光とを受光し、受光した光に応じた信号を出力する第１受光ステップと、
前記光出力ステップから出力されて前記被測定体で反射した後に前記濾光ステップを透過した散乱光と、前記被測定体で反射した後に前記濾光ステップを透過した外来光とを受光し、受光した光に応じた信号を出力する第２受光ステップと、
前記光出力ステップ、および前記第１受光ステップを制御する制御ステップと、
前記第１受光ステップから出力された信号と前記第２受光ステップから出力された信号の差分の信号を得る差分抽出ステップと、
前記光出力ステップから光が出力されないように前記制御ステップが前記光出力ステップを制御し、前記第１受光ステップが光に応答しないように前記制御ステップに制御された時に前記差分抽出ステップで得られる第１信号を記憶部に記憶させ、
前記光出力ステップから光が出力されるように前記制御ステップが前記光出力ステップを制御し、前記第１受光ステップが光に応答しないように前記制御ステップに制御された時に前記差分抽出ステップで得られる第２信号を前記記憶部に記憶させ、
前記記憶部に記憶させた前記第１信号と前記第２信号の差分を表す第３信号を前記記憶部に記憶させる記憶制御ステップと、
前記光出力ステップから光が出力されるように前記制御ステップが前記光出力ステップを制御し、前記第１受光ステップが光に応答するように前記制御ステップに制御された時に前記差分抽出ステップで得られる信号を、前記記憶部に記憶された第３信号で補正する補正ステップと、
前記補正ステップで補正された信号から前記被測定体の情報を生成する情報生成ステップとを有する。
本発明によれば、外来光や散乱光の影響を受けず、制度良く測定を行うことができる。 A filtering step that transmits light of a predetermined wavelength;
A light output step for outputting light to the object to be measured;
The measurement light output from the light output step and reflected by the measured object and then transmitted through the filtering step and the extraneous light reflected by the measured object and transmitted through the filtering step are received and received. A first light receiving step for outputting a signal in accordance with the emitted light;
The scattered light that is output from the light output step and reflected by the object to be measured and then transmitted through the filtering step and the extraneous light that is reflected by the object to be measured and then transmitted through the filtering step are received and received. A second light receiving step for outputting a signal in accordance with the emitted light;
A control step for controlling the light output step and the first light receiving step;
A difference extraction step for obtaining a difference signal between the signal output from the first light receiving step and the signal output from the second light receiving step;
Obtained in the difference extraction step when the control step controls the light output step so that light is not output from the light output step, and when the control step is controlled so that the first light receiving step does not respond to light. Storing the first signal in the storage unit;
Obtained in the difference extraction step when the control step controls the light output step so that light is output from the light output step, and when the control step is controlled so that the first light receiving step does not respond to light. The second signal to be stored in the storage unit,
A storage control step of storing a third signal representing a difference between the first signal and the second signal stored in the storage unit in the storage unit;
Obtained in the difference extraction step when the control step controls the light output step so that light is output from the light output step, and when the first light receiving step is controlled by the control step to respond to light. A correction step of correcting the received signal with the third signal stored in the storage unit;
An information generation step of generating information on the object to be measured from the signal corrected in the correction step.
According to the present invention, it is possible to perform measurement systematically without being influenced by external light or scattered light.

本発明の一実施形態に係る測定装置１のハードウェア構成のブロック図。The block diagram of the hardware constitutions of the measuring apparatus 1 which concerns on one Embodiment of this invention. 光源１０と検出部２０の電気的構成を示した図。The figure which showed the electrical structure of the light source 10 and the detection part 20. FIG. 制御部３０が行う処理の流れを示したフローチャート。The flowchart which showed the flow of the process which the control part 30 performs. 本発明の変形例に係る測定装置１の電気的構成を示した図。The figure which showed the electrical structure of the measuring apparatus 1 which concerns on the modification of this invention.

［実施形態］
（全体構成）
図１は、本発明の一実施形態に係る測定装置１の構成を示したブロック図である。測定装置１は、生体（被測定体）の脈拍や脈波を測定する装置であり、光源１０、検出部２０、制御部３０、記憶部３５、表示部４０および操作部５０を備えている。 [Embodiment]
(overall structure)
FIG. 1 is a block diagram showing a configuration of a measuring apparatus 1 according to an embodiment of the present invention. The measuring device 1 is a device that measures the pulse and pulse wave of a living body (measurement object), and includes a light source 10, a detection unit 20, a control unit 30, a storage unit 35, a display unit 40, and an operation unit 50.

光源１０は、光を出力する発光ダイオードを備えており、発光ダイオードの光を生体へ照射する。
検出部２０は、光を電気信号に変換する受光素子を備えており、生体を透過した光を受光素子で受光し、受光した光に対応した信号を出力する。
制御部３０は、ＣＰＵ（Central Processing Unit）、ＲＯＭ（Read Only Memory）、ＲＡＭ（Random Access Memory）、入力ポートおよび出力ポートを備えた、所謂マイクロコンピュータである。制御部３０は、ＲＯＭに記憶されたプログラムに従って動作し、光源１０及び検出部２０の制御を行う。また、制御部３０は、検出部２０から出力された信号を解析して生体の脈拍や脈波を測定し、表示部４０を制御して測定結果を表示部４０に表示させる。
記憶部３５は、不揮発性メモリであり制御部３０に接続されている。記憶部３５は、制御部３０の制御の下、検出部２０から出力された信号を記憶する。
表示部４０は、液晶ディスプレイ装置を備えており、制御部３０が測定した結果を表示する。なお、本実施形態においては、表示部４０は液晶ディスプレイ装置で測定結果の表示を行うが、表示を行うのは液晶ディスプレイ装置に限定されず、有機ＥＬ（Electro-Luminescence）を用いた表示装置など、他の表示装置であってもよい。
操作部５０は制御部３０に接続されており、測定装置１を操作するための操作子を備えている。制御部３０は操作子に行われた操作を監視し、行われた操作に応じて光源１０や検出部２０の制御、測定結果の表示を行う。 The light source 10 includes a light emitting diode that outputs light, and irradiates the living body with light from the light emitting diode.
The detection unit 20 includes a light receiving element that converts light into an electrical signal. The light receiving element receives light transmitted through the living body, and outputs a signal corresponding to the received light.
The control unit 30 is a so-called microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an input port, and an output port. The control unit 30 operates according to a program stored in the ROM, and controls the light source 10 and the detection unit 20. In addition, the control unit 30 analyzes the signal output from the detection unit 20 to measure the pulse and pulse wave of the living body, and controls the display unit 40 to display the measurement result on the display unit 40.
The storage unit 35 is a nonvolatile memory and is connected to the control unit 30. The storage unit 35 stores a signal output from the detection unit 20 under the control of the control unit 30.
The display unit 40 includes a liquid crystal display device, and displays a result measured by the control unit 30. In the present embodiment, the display unit 40 displays the measurement result on a liquid crystal display device, but the display is not limited to the liquid crystal display device, and a display device using organic EL (Electro-Luminescence), etc. Other display devices may be used.
The operation unit 50 is connected to the control unit 30 and includes an operator for operating the measurement apparatus 1. The control unit 30 monitors the operation performed on the operator, and controls the light source 10 and the detection unit 20 and displays the measurement result according to the performed operation.

（電気的構成）
図２は、光源１０と検出部２０の電気的構成を示した図である。
本実施形態においては、光源１０は、予め定められた単一波長の光を出力する発光ダイオードであり、光源１０が出力する光の波長λは近赤外の領域内（７００［ｎｍ］〜１２００［ｎｍ］）となっている。光源１０には電源に接続されたスイッチ１１が接続されており、このスイッチ１１は、制御部３０からの信号Ｓ１によって開／閉が切り替えられ、光源１０を点灯または消灯させる。 (Electrical configuration)
FIG. 2 is a diagram illustrating an electrical configuration of the light source 10 and the detection unit 20.
In the present embodiment, the light source 10 is a light emitting diode that outputs light having a predetermined single wavelength, and the wavelength λ of the light output from the light source 10 is in the near-infrared region (700 [nm] to 1200). [Nm]). A switch 11 connected to a power source is connected to the light source 10, and this switch 11 is switched between open and closed by a signal S1 from the control unit 30, and turns on or off the light source 10.

第１受光素子２０Ａ（第１受光手段）と第２受光素子２０Ｂ（第２受光手段）は、受光した光に応じて電流が流れるフォトダイオードである。第１受光素子２０Ａと第２受光素子２０Ｂは、両者ともアノードが減算回路２４に接続されており、第１受光素子２０Ａは第１トランジスタＴＲ１を介して逆バイアスが掛けられ、第２受光素子２０Ｂは第２トランジスタＴＲ２を介して逆バイアスが掛けられる。   The first light receiving element 20A (first light receiving means) and the second light receiving element 20B (second light receiving means) are photodiodes through which a current flows in accordance with the received light. Both the first light receiving element 20A and the second light receiving element 20B have anodes connected to the subtracting circuit 24. The first light receiving element 20A is reverse-biased via the first transistor TR1, and the second light receiving element 20B. Is reverse-biased via the second transistor TR2.

第１トランジスタＴＲ１は、第１受光素子２０Ａに電流を流すスイッチとして動作するトランジスタである。第１トランジスタＴＲ１は、ドレインが電源、ソースが第１受光素子２０Ａのカソード、ゲートが制御部３０に接続されており、制御部３０からの信号Ｓ２によりゲートに電圧が印加されると第１受光素子２０Ａに電流を流し、信号Ｓ２によりゲートに電圧が印加されない状態となると、第１受光素子２０Ａに流れる電流を遮断する。
また、第２トランジスタＴＲ２は、第２受光素子２０Ｂに電流を流すスイッチとして動作するトランジスタである。第２トランジスタＴＲ２は、ドレインが電源、ソースが第２受光素子２０Ｂのカソード、ゲートが制御部３０に接続されており、制御部３０からの信号Ｓ３によりゲートに電圧が印加されると第２受光素子２０Ｂに電流を流し、信号Ｓ３によりゲートに電圧が印加されない状態となると、第２受光素子２０Ｂに流れる電流を遮断する。 The first transistor TR1 is a transistor that operates as a switch for passing a current through the first light receiving element 20A. The first transistor TR1 has a drain connected to the power supply, a source connected to the cathode of the first light receiving element 20A, and a gate connected to the control unit 30. When a voltage is applied to the gate by a signal S2 from the control unit 30, the first light receiving light is received. When a current is passed through the element 20A and no voltage is applied to the gate due to the signal S2, the current flowing through the first light receiving element 20A is cut off.
The second transistor TR2 is a transistor that operates as a switch for passing a current to the second light receiving element 20B. The second transistor TR2 has a drain connected to the power supply, a source connected to the cathode of the second light receiving element 20B, and a gate connected to the control unit 30. When a voltage is applied to the gate by a signal S3 from the control unit 30, the second light receiving light is received. When a current is passed through the element 20B and no voltage is applied to the gate due to the signal S3, the current flowing through the second light receiving element 20B is cut off.

第１フィルタ２１Ａと第２フィルタ２１Ｂは、光源１０が出力する光の波長と同じ波長の光を透過するフィルタ（濾光手段）であり、第１フィルタ２１Ａは第１受光素子２０Ａの受光部分に配置され、第２フィルタ２１Ｂは第２受光素子２０Ｂの受光部分に配置されている。   The first filter 21A and the second filter 21B are filters (filtering means) that transmit light having the same wavelength as the light output from the light source 10, and the first filter 21A is provided in the light receiving portion of the first light receiving element 20A. The second filter 21B is disposed in the light receiving portion of the second light receiving element 20B.

減算回路２４（差分抽出手段）は、オペアンプを用いた減算回路である。減算回路２４は、第２受光素子２０Ｂからの信号を、第１受光素子２０Ａからの信号から減算し、減算により得られた信号を増幅回路２２へ出力する。
増幅回路２２は、オペアンプを用いた反転増幅回路を備えており、減算回路２４から入力される信号を増幅してＡ／Ｄコンバータ２３へ出力する。 The subtraction circuit 24 (difference extraction means) is a subtraction circuit using an operational amplifier. The subtraction circuit 24 subtracts the signal from the second light receiving element 20B from the signal from the first light receiving element 20A, and outputs the signal obtained by the subtraction to the amplifier circuit 22.
The amplifier circuit 22 includes an inverting amplifier circuit using an operational amplifier, amplifies the signal input from the subtractor circuit 24, and outputs the amplified signal to the A / D converter 23.

制御部３０に接続されているＡ／Ｄコンバータ２３は、アナログ信号をデジタル信号に変換する回路を備えており、オペアンプＯＰの出力端子から出力されたアナログ信号をデジタル信号に変換し、このデジタル信号を制御部３０へ出力する。   The A / D converter 23 connected to the control unit 30 includes a circuit for converting an analog signal into a digital signal, converts the analog signal output from the output terminal of the operational amplifier OP into a digital signal, and this digital signal. Is output to the control unit 30.

（実施形態の動作）
次に、測定装置１の動作について説明する。
まず、図示せぬ電源から電力が測定装置１の各部へ供給されると、制御部３０においては、ＲＯＭに記憶されている制御プログラムが起動される。制御プログラムが起動された後、操作部５０において脈拍と脈波の測定開始を指示する操作が行われると、制御部３０から出力された信号Ｓ１によってスイッチ１１が開にされ（図３：ステップＳ１）、電源から光源１０へ電流が流れないため光源１０が消灯する。 (Operation of the embodiment)
Next, the operation of the measuring apparatus 1 will be described.
First, when power is supplied from a power source (not shown) to each unit of the measuring apparatus 1, the control unit 30 starts a control program stored in the ROM. After the control program is started, when the operation unit 50 is operated to instruct the start of pulse and pulse wave measurement, the switch 11 is opened by the signal S1 output from the control unit 30 (FIG. 3: step S1). ) Since no current flows from the power source to the light source 10, the light source 10 is turned off.

次に、制御部３０は、信号Ｓ２で第１トランジスタＴＲ１をＯＦＦとし、信号Ｓ３で第２トランジスタＴＲ２をＯＮとする（ステップＳ２）。第１トランジスタＴＲ１がＯＦＦとなると、第１受光素子２０Ａへ電流が流れない。一方、第２トランジスタＴＲ２がＯＮとなると、電源から第２受光素子２０Ｂへ電流が流れる。   Next, the control unit 30 turns off the first transistor TR1 with the signal S2, and turns on the second transistor TR2 with the signal S3 (step S2). When the first transistor TR1 is turned off, no current flows to the first light receiving element 20A. On the other hand, when the second transistor TR2 is turned on, a current flows from the power source to the second light receiving element 20B.

ここで、照明機器の光や太陽光など（以下、これらの光を外来光と称する）、光源１０から出力された光ではない光βが生体１００に到達すると、波長が１５００［ｎｍ］以上の光は生体１００を透過せず、近赤外の領域の波長の光が生体１００を透過し、透過した光β２は第１フィルタ２１Ａに到達し、透過した光β１は第２フィルタ２１Ｂに到達する。   Here, when light β that is not light output from the light source 10, such as light from an illumination device or sunlight (hereinafter referred to as external light) reaches the living body 100, the wavelength is 1500 [nm] or more. Light does not pass through the living body 100, light having a wavelength in the near-infrared region passes through the living body 100, the transmitted light β2 reaches the first filter 21A, and the transmitted light β1 reaches the second filter 21B. .

第１フィルタ２１Ａにおいては光β２に含まれている波長λの光が透過し、この透過した光は第１受光素子２０Ａに到達するが、第１トランジスタＴＲ１がＯＦＦとなっているため、第１受光素子２０Ａから減算回路２４へ電流が流れない。
一方、第２フィルタ２１Ｂにおいては、光β１に含まれている波長λの光が第２フィルタ２１Ｂを透過する。そして、この透過した光が第２受光素子２０Ｂに到達すると、透過した光β１に応じた電流Ｉβ１が減算回路２４へ流れる。 In the first filter 21A, the light having the wavelength λ included in the light β2 is transmitted, and the transmitted light reaches the first light receiving element 20A, but the first transistor TR1 is OFF, so the first filter No current flows from the light receiving element 20A to the subtraction circuit 24.
On the other hand, in the second filter 21B, the light having the wavelength λ included in the light β1 is transmitted through the second filter 21B. When the transmitted light reaches the second light receiving element 20B, a current Iβ1 corresponding to the transmitted light β1 flows to the subtraction circuit 24.

減算回路２４においては、第１受光素子２０Ａの信号から、第２受光素子２０Ｂの信号が減算される。そして、この減算により得られた信号は増幅回路２２において増幅された後、Ａ／Ｄコンバータ２３によって、デジタル信号に変換され、このデジタル信号は制御部３０へ入力される。制御部３０に入力されるデジタル信号は、外来光による光β１に対応したもの、つまり、光源１０から出力されて生体１００を透過した光とは異なる光に対応したものであり、脈拍や脈波を測定する際にノイズとなる信号である。制御部３０は、入力されるデジタル信号を第１のノイズ信号として記憶部３５に記憶する（ステップＳ３）。   In the subtraction circuit 24, the signal of the second light receiving element 20B is subtracted from the signal of the first light receiving element 20A. The signal obtained by this subtraction is amplified by the amplifier circuit 22 and then converted into a digital signal by the A / D converter 23, and this digital signal is input to the control unit 30. The digital signal input to the control unit 30 corresponds to the light β1 generated by the external light, that is, corresponds to the light different from the light output from the light source 10 and transmitted through the living body 100, and the pulse or pulse wave. It is a signal that becomes noise when measuring. The control unit 30 stores the input digital signal as the first noise signal in the storage unit 35 (step S3).

次に、制御部３０は、スイッチ１１を閉にする信号Ｓ１を出力する（ステップＳ４）。すると、スイッチ１１が閉じて光源１０へ電流が流れ、光源１０が点灯して生体１００へ波長λの光αが照射される。
光αのうち、生体１００を透過した光α１は第１フィルタ２１Ａに到達し、光源１０から出力されて生体１００を透過した散乱光α２は第２フィルタ２１Ｂに到達する。また、ここで外来光である光βが生体１００に到達すると、この光βのうち、生体１００を透過した光β２は第１フィルタ２１Ａに到達し、透過した光β１は第２フィルタ２１Ｂに到達する。 Next, the control unit 30 outputs a signal S1 for closing the switch 11 (step S4). Then, the switch 11 is closed, a current flows to the light source 10, the light source 10 is turned on, and the living body 100 is irradiated with the light α having the wavelength λ.
Of the light α, the light α1 transmitted through the living body 100 reaches the first filter 21A, and the scattered light α2 output from the light source 10 and transmitted through the living body 100 reaches the second filter 21B. In addition, when the light β, which is extraneous light, reaches the living body 100, the light β2 that has passed through the living body 100 reaches the first filter 21A, and the transmitted light β1 reaches the second filter 21B. To do.

第１フィルタ２１Ａにおいては、光α１と光β２に含まれている波長λの光が透過するが、第１トランジスタＴＲ１がＯＦＦとなっているため、第１受光素子２０Ａから減算回路２４へ電流が流れない。
一方、第２フィルタ２１Ｂにおいては、散乱光α２に含まれている波長λの光が透過すると共に、光β１に含まれている波長λの光が透過する。そして、この透過した光が第２受光素子２０Ｂに到達すると、透過した光に応じた電流が減算回路２４へ流れる。 In the first filter 21A, the light of the wavelength λ included in the light α1 and the light β2 is transmitted, but since the first transistor TR1 is OFF, a current flows from the first light receiving element 20A to the subtraction circuit 24. Not flowing.
On the other hand, in the second filter 21B, the light having the wavelength λ included in the scattered light α2 is transmitted and the light having the wavelength λ included in the light β1 is transmitted. When the transmitted light reaches the second light receiving element 20B, a current corresponding to the transmitted light flows to the subtraction circuit 24.

ここで、減算回路２４においては、第１受光素子２０Ａの信号から、第２受光素子２０Ｂの信号が減算される。そして、この減算により得られた信号は増幅回路２２において増幅された後、Ａ／Ｄコンバータ２３によって、デジタル信号に変換され、このデジタル信号は制御部３０へ入力される。制御部３０に入力されるデジタル信号は、散乱光α２と光β１に対応したもの、つまり、脈拍や脈波を測定する際にノイズとなる信号である。制御部３０は、入力されるデジタル信号を第２のノイズ信号として記憶部３５に記憶する（ステップＳ５）。   Here, in the subtraction circuit 24, the signal of the second light receiving element 20B is subtracted from the signal of the first light receiving element 20A. The signal obtained by this subtraction is amplified by the amplifier circuit 22 and then converted into a digital signal by the A / D converter 23, and this digital signal is input to the control unit 30. The digital signal input to the control unit 30 is a signal corresponding to the scattered light α2 and the light β1, that is, a signal that becomes noise when measuring a pulse or a pulse wave. The control unit 30 stores the input digital signal as the second noise signal in the storage unit 35 (step S5).

次に制御部３０は、記憶部３５に記憶された第１のノイズ信号と、記憶部３５に記憶された第２のノイズ信号との間で減算処理を行う（ステップＳ６）。ここで、第１のノイズ信号は光β１の成分を含むものであり、第２のノイズ信号は散乱光α２と光β１の成分を含むものであるため、第２のノイズ信号から第１のノイズ信号を減算する処理を行うと、ノイズ信号における光α２の成分を得ることができる。制御部３０は、演算により散乱光α２の成分を得ると、この散乱光α２の成分を表す第３のノイズ信号を記憶部３５に記憶する（ステップＳ７）。   Next, the control unit 30 performs a subtraction process between the first noise signal stored in the storage unit 35 and the second noise signal stored in the storage unit 35 (step S6). Here, since the first noise signal includes the component of the light β1, and the second noise signal includes the components of the scattered light α2 and the light β1, the first noise signal is obtained from the second noise signal. When the subtraction process is performed, the component of the light α2 in the noise signal can be obtained. When the control unit 30 obtains the component of the scattered light α2 by calculation, the control unit 30 stores a third noise signal representing the component of the scattered light α2 in the storage unit 35 (step S7).

次に制御部３０は、生体１００の測定を開始する。まず、制御部３０は、信号Ｓ２で第１トランジスタＴＲ１をＯＮとする（ステップＳ８）。第１トランジスタＴＲ１がＯＮとなると、第１受光素子２０Ａへ電流が流れる。
ここで、光αのうち生体１００を透過した光α１は第１フィルタ２１Ａに到達し、光αのうち生体１００を透過した散乱光α２は第２フィルタ２１Ｂに到達している。また、外来光である光βのうち生体１００を透過した光β２は第１フィルタ２１Ａに到達し、光β１は第２フィルタ２１Ｂに到達している。 Next, the control unit 30 starts measuring the living body 100. First, the control unit 30 turns on the first transistor TR1 with the signal S2 (step S8). When the first transistor TR1 is turned on, a current flows to the first light receiving element 20A.
Here, the light α1 transmitted through the living body 100 out of the light α reaches the first filter 21A, and the scattered light α2 transmitted through the living body 100 out of the light α reaches the second filter 21B. In addition, the light β2 that has passed through the living body 100 out of the light β that is external light reaches the first filter 21A, and the light β1 reaches the second filter 21B.

第１フィルタ２１Ａにおいては、光α１に含まれている波長λの光が透過すると共に、光β２に含まれている波長λの光が透過する。そして、この透過した光が第１受光素子２０Ａに到達すると、第１トランジスタＴＲ１がＯＮとなっているため、透過した光に応じた電流Ｉａが第１受光素子２０Ａに流れる。ここで、電流Ｉａは、光α１によって流れる電流Ｉα１の成分と、光β２によって流れる電流Ｉβ２の成分を含む。
また、第２フィルタ２１Ｂにおいては、散乱光α２に含まれている波長λの光が透過すると共に、光β１に含まれている波長λの光が透過する。そして、この透過した光が第２受光素子２０Ｂに到達すると、透過した光に応じた電流Ｉｂが第２受光素子２０Ｂに流れる。ここで、電流Ｉｂは、光α２によって流れる電流Ｉα２の成分と、光β１によって流れる電流Ｉβ１の成分を含む。 In the first filter 21A, light having a wavelength λ included in the light α1 is transmitted and light having a wavelength λ included in the light β2 is transmitted. When the transmitted light reaches the first light receiving element 20A, the first transistor TR1 is turned on, so that a current Ia corresponding to the transmitted light flows through the first light receiving element 20A. Here, the current Ia includes a component of the current Iα1 that flows by the light α1 and a component of the current Iβ2 that flows by the light β2.
Further, in the second filter 21B, the light with the wavelength λ included in the scattered light α2 is transmitted, and the light with the wavelength λ included in the light β1 is transmitted. When the transmitted light reaches the second light receiving element 20B, a current Ib corresponding to the transmitted light flows through the second light receiving element 20B. Here, the current Ib includes a component of the current Iα2 that flows by the light α2 and a component of the current Iβ1 that flows by the light β1.

ここで減算回路２４から増幅回路２２へ出力される信号は、第１受光素子２０Ａに流れる電流Ｉａと第２受光素子２０Ｂに流れる電流Ｉｂの差分となり、この信号は、増幅回路２２において増幅された後、Ａ／Ｄコンバータ２３によって、デジタル信号に変換され、このデジタル信号は制御部３０へ入力される。
なお、第１受光素子２０Ａに到達する光β２と第２受光素子２０Ｂに到達する光β１は同じであるため、電流Ｉβ２と電流Ｉβ１は同じとなり、増幅回路２２へ流れる信号は、電流Ｉα１と電流Ｉα２との差分になる。 Here, the signal output from the subtracting circuit 24 to the amplifier circuit 22 is a difference between the current Ia flowing through the first light receiving element 20A and the current Ib flowing through the second light receiving element 20B, and this signal is amplified by the amplifier circuit 22. Thereafter, the signal is converted into a digital signal by the A / D converter 23, and this digital signal is input to the control unit 30.
Since the light β2 reaching the first light receiving element 20A and the light β1 reaching the second light receiving element 20B are the same, the current Iβ2 and the current Iβ1 are the same, and the signal flowing to the amplifier circuit 22 is the current Iα1 and the current It becomes a difference from Iα2.

そして制御部３０は、Ａ／Ｄコンバータ２３からデジタル信号が入力されると、記憶部３５から散乱光α２の成分を表す第３のノイズ信号を読み出し、入力されたデジタル信号における散乱光α２の影響を補正するため、Ａ／Ｄコンバータ２３から入力されているデジタル信号を第３のノイズ信号を用いて補正する処理を行う（ステップＳ９）。
そして、制御部３０は、この補正処理により得られたデジタル信号を解析して脈拍や脈波の波形を得た後、表示部４０を制御して脈拍や脈波の波形を表示する（ステップＳ１０）。つまり、制御部３０は、生体に関する情報を生成する情報生成部として機能する。 When the digital signal is input from the A / D converter 23, the control unit 30 reads the third noise signal representing the component of the scattered light α2 from the storage unit 35, and the influence of the scattered light α2 on the input digital signal. Is corrected using the third noise signal for the digital signal input from the A / D converter 23 (step S9).
Then, the control unit 30 analyzes the digital signal obtained by the correction process to obtain a pulse or pulse wave waveform, and then controls the display unit 40 to display the pulse or pulse wave waveform (step S10). ). That is, the control unit 30 functions as an information generation unit that generates information related to a living body.

本実施形態においては、増幅回路２２で増幅される信号においては光βによる成分は除かれ、制御部３０においては、散乱光α２の影響が補正されるため、制御部３０で得られる脈波の波形は、精度良く脈波の波形を表すこととなる。   In the present embodiment, the component amplified by the light β is removed from the signal amplified by the amplifier circuit 22, and the control unit 30 corrects the influence of the scattered light α2, so that the pulse wave obtained by the control unit 30 is corrected. The waveform represents the waveform of the pulse wave with high accuracy.

［変形例］
以上、本発明の実施形態について説明したが、本発明は上述した実施形態に限定されることなく、他の様々な形態で実施可能である。例えば、上述の実施形態を以下のように変形して本発明を実施してもよい。 [Modification]
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above, It can implement with another various form. For example, the present invention may be implemented by modifying the above-described embodiment as follows.

上述した実施形態においては、光源１０は単一波長の光を出力する発光ダイオードであるが、所謂白色の発光ダイオードなど、複数の波長の光を出力する発光ダイオードであってもよい。この場合、光源１０と生体１００との間に第１フィルタ２１Ａおよび第２フィルタ２１Ｂと同じフィルタ（濾光手段）を配置し、波長λの光のみが生体１００に照射されるようにしてもよい。この構成によれば、単一の波長の光が生体に照射され、精度良く測定を行うことができる。
また、上述した実施形態においては、光源１０は発光ダイオードとなっているが、レーザー光を出力するレーザー素子であってもよい。 In the embodiment described above, the light source 10 is a light emitting diode that outputs light of a single wavelength, but may be a light emitting diode that outputs light of a plurality of wavelengths, such as a so-called white light emitting diode. In this case, the same filter (filtering means) as the first filter 21A and the second filter 21B may be disposed between the light source 10 and the living body 100 so that only the light having the wavelength λ is irradiated on the living body 100. . According to this configuration, the living body is irradiated with light having a single wavelength, and measurement can be performed with high accuracy.
In the embodiment described above, the light source 10 is a light emitting diode, but may be a laser element that outputs laser light.

上述した測定装置１は、生体１００を透過した光を検出する透過型の測定装置であるが、図４に示したように、光源１０から生体１００に照射されて生体１００の血管内で反射した光を検出する構成であってもよい。   The measurement apparatus 1 described above is a transmission type measurement apparatus that detects light transmitted through the living body 100. However, as shown in FIG. 4, the living body 100 is irradiated from the light source 10 and reflected within the blood vessel of the living body 100. The structure which detects light may be sufficient.

本発明においては、第１受光素子２０Ａから出力された信号を増幅してＡ／Ｄ変換すると共に、第２受光素子２０Ｂから出力された信号を増幅してＡ／Ｄ変換し、これらの信号を制御部３０へ入力し、制御部３０において減算回路２４と同様の減算処理を行うようにしてもよい。   In the present invention, the signal output from the first light receiving element 20A is amplified and A / D converted, and the signal output from the second light receiving element 20B is amplified and A / D converted. It may be inputted to the control unit 30 and the control unit 30 may perform the same subtraction processing as that of the subtraction circuit 24.

本発明においては、第２トランジスタＴＲ２を設けずに電源から第２受光素子２０Ｂへ逆バイアスを掛けるようにしてもよい。   In the present invention, a reverse bias may be applied from the power source to the second light receiving element 20B without providing the second transistor TR2.

上述した実施形態においては、各受光素子の受光部分に配置されているフィルタは、第１フィルタ２１Ａと第２フィルタ２１Ｂとに分かれているが、第１フィルタ２１Ａと第２フィルタ２１Ｂは一体であってもよい。   In the embodiment described above, the filter disposed in the light receiving portion of each light receiving element is divided into the first filter 21A and the second filter 21B, but the first filter 21A and the second filter 21B are integrated. May be.

１・・・測定装置、１０・・・光源、１１・・・スイッチ、２０Ａ・・・第１受光素子、２０Ｂ・・・第２受光素子、２１Ａ・・・第１フィルタ、２１Ｂ・・・第２フィルタ、２２・・・増幅回路、２３・・・Ａ／Ｄコンバータ、２４・・・減算回路、３０・・・制御部、３５・・・記憶部、４０・・・表示部、５０・・・操作部、１００・・・生体 DESCRIPTION OF SYMBOLS 1 ... Measuring apparatus, 10 ... Light source, 11 ... Switch, 20A ... 1st light receiving element, 20B ... 2nd light receiving element, 21A ... 1st filter, 21B ... 1st 2 filters, 22 ... amplifier circuit, 23 ... A / D converter, 24 ... subtracting circuit, 30 ... control unit, 35 ... storage unit, 40 ... display unit, 50 ...・ Operation unit, 100 ... living body

Claims (5)

予め定められた波長の光を透過する濾光手段と、
被測定体に光を出力する光出力手段と、
前記光出力手段から出力されて前記被測定体を透過した後に前記濾光手段を透過した測定光と、前記被測定体を透過した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第１受光手段と、
前記光出力手段から出力されて前記被測定体を透過した後に前記濾光手段を透過した散乱光と、前記被測定体を透過した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第２受光手段と、
前記光出力手段、および前記第１受光手段を制御する制御手段と、
前記第１受光手段から出力された信号と前記第２受光手段から出力された信号の差分の信号を得る差分抽出手段と、
前記光出力手段から光が出力されないように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第１信号を記憶部に記憶させ、
前記光出力手段から光が出力されるように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第２信号を前記記憶部に記憶させ、
前記記憶部に記憶された第１信号と第２信号の差分を表す第３信号を前記記憶部に記憶させる記憶部制御手段と、
前記光出力手段から光が出力されるように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答するように前記制御手段に制御された時に前記差分抽出手段で得られる信号を、前記記憶部に記憶された第３信号で補正する補正手段と、
前記補正手段で補正された信号から前記被測定体の情報を生成する情報生成手段と
を有する測定装置。 Filtering means for transmitting light of a predetermined wavelength;
Light output means for outputting light to the measurement object;
Receives the measurement light output from the light output means and transmitted through the measured object after passing through the measured object, and extraneous light transmitted through the measured object after passing through the measured object, First light receiving means for outputting a signal in accordance with the received light;
Receiving scattered light output from the light output means and transmitted through the filter after being transmitted through the measured object; and extraneous light transmitted through the filter after being transmitted through the measured object; Second light receiving means for outputting a signal in accordance with the received light;
Control means for controlling the light output means and the first light receiving means;
Difference extraction means for obtaining a difference signal between the signal output from the first light receiving means and the signal output from the second light receiving means;
Obtained by the difference extraction means when the control means controls the light output means so that light is not output from the light output means, and the control means is controlled so that the first light receiving means does not respond to light. Storing the first signal in the storage unit;
Obtained by the difference extraction means when the control means controls the light output means so that light is output from the light output means, and the control means is controlled so that the first light receiving means does not respond to light. The second signal to be stored in the storage unit,
Storage unit control means for storing a third signal representing a difference between the first signal and the second signal stored in the storage unit in the storage unit;
Obtained by the difference extraction means when the control means controls the light output means so that light is output from the light output means, and when the first light receiving means is controlled by the control means to respond to light. Correction means for correcting the received signal with the third signal stored in the storage unit;
An information generating unit that generates information on the object to be measured from the signal corrected by the correcting unit. 予め定められた波長の光を透過する濾光手段と、
被測定体に光を出力する光出力手段と、
前記光出力手段から出力されて前記被測定体で反射した後に前記濾光手段を透過した測定光と、前記被測定体で反射した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第１受光手段と、
前記光出力手段から出力されて前記被測定体で反射した後に前記濾光手段を透過した散乱光と、前記被測定体で反射した後に前記濾光手段を透過した外来光とを受光し、受光した光に応じた信号を出力する第２受光手段と、
前記光出力手段、および前記第１受光手段を制御する制御手段と、
前記第１受光手段から出力された信号と前記第２受光手段から出力された信号の差分の信号を得る差分抽出手段と、
前記光出力手段から光が出力されないように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第１信号を記憶部に記憶させ、
前記光出力手段から光が出力されるように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答しないように前記制御手段に制御された時に前記差分抽出手段で得られる第２信号を前記記憶部に記憶させ、
前記記憶部に記憶された第１信号と第２信号の差分を表す第３信号を前記記憶部に記憶させる記憶部制御手段と、
前記光出力手段から光が出力されるように前記制御手段が前記光出力手段を制御し、前記第１受光手段が光に応答するように前記制御手段に制御された時に前記差分抽出手段で得られる信号を、前記記憶部に記憶された第３信号で補正する補正手段と、
前記補正手段で補正された信号から前記被測定体の情報を生成する情報生成手段と
を有する測定装置。 Filtering means for transmitting light of a predetermined wavelength;
Light output means for outputting light to the measurement object;
Receiving the measurement light output from the light output means and reflected by the object to be measured and then transmitted through the filtering means; and extraneous light reflected by the object to be measured and then transmitted through the filtering means; First light receiving means for outputting a signal in accordance with the received light;
Receiving scattered light output from the light output means and reflected by the object to be measured and then transmitted through the filtering means; and extraneous light reflected by the object to be measured and transmitted through the filtering means. Second light receiving means for outputting a signal in accordance with the received light;
Control means for controlling the light output means and the first light receiving means;
Difference extraction means for obtaining a difference signal between the signal output from the first light receiving means and the signal output from the second light receiving means;
Obtained by the difference extraction means when the control means controls the light output means so that light is not output from the light output means, and the control means is controlled so that the first light receiving means does not respond to light. Storing the first signal in the storage unit;
Obtained by the difference extraction means when the control means controls the light output means so that light is output from the light output means, and the control means is controlled so that the first light receiving means does not respond to light. The second signal to be stored in the storage unit,
Storage unit control means for storing a third signal representing a difference between the first signal and the second signal stored in the storage unit in the storage unit;
Obtained by the difference extraction means when the control means controls the light output means so that light is output from the light output means, and when the first light receiving means is controlled by the control means to respond to light. Correction means for correcting the received signal with the third signal stored in the storage unit;
An information generating unit that generates information on the object to be measured from the signal corrected by the correcting unit. 前記濾光手段と同じ波長の光を透過する第２濾光手段を有し、
前記光出力手段から出力されて前記第２濾光手段を透過した光が前記被測定体に照射されること
を特徴とする請求項１または請求項２に記載の測定装置。 Second filtering means that transmits light of the same wavelength as the filtering means;
The measuring apparatus according to claim 1, wherein the measurement object is irradiated with light output from the light output unit and transmitted through the second filtering unit. 前記光出力手段から出力される光は、複数の波長の光を含むことを特徴とする請求項３に記載の測定装置。   The measuring apparatus according to claim 3, wherein the light output from the light output means includes light having a plurality of wavelengths. 光出力手段から出力されて前記被測定体を透過した後に予め定められた波長の光を透過する濾光手段を透過した測定光と、前記被測定体を透過した後に前記濾光手段を透過した外来光とが受光可能であって、受光した光に応じた信号を出力する第１受光手段が、光に応答しないように制御される第１制御ステップと、  Measurement light transmitted from the light output means and transmitted through the measured object and then transmitted through the filtering means that transmits light of a predetermined wavelength, and transmitted through the measured object and transmitted through the filtered means A first control step in which external light is receivable and a first light receiving means for outputting a signal corresponding to the received light is controlled so as not to respond to the light;
前記第１制御ステップの後のステップであり、前記光出力手段から光が出力されない状態で、前記第１受光手段からの信号と、前記光出力手段から出力されて被測定体を透過した散乱光と、前記被測定体を透過した外来光とが受光可能であって、受光した光に応じた信号を出力する第２受光手段から出力された信号との差分の信号を記憶する第１記憶ステップと、  A step after the first control step, in a state where no light is output from the light output means, and a signal from the first light receiving means and scattered light output from the light output means and transmitted through the measurement object And a first storage step for storing a difference signal between the second light receiving means for outputting a signal corresponding to the received light and capable of receiving the extraneous light transmitted through the object to be measured. When,
前記第１制御ステップの後のステップであり、前記光出力手段から光が出力された状態で、前記第１受光手段からの信号と前記第２受光手段からの信号との差分の信号を記憶する第２記憶ステップと、  This is a step after the first control step, and stores a difference signal between the signal from the first light receiving means and the signal from the second light receiving means in a state where light is output from the light output means. A second storage step;
前記第１記憶ステップで記憶された信号と前記第２記憶ステップで記憶された信号との差分の信号を記憶する第３記憶ステップと、  A third storage step for storing a difference signal between the signal stored in the first storage step and the signal stored in the second storage step;
前記第１受光手段が光に応答するように制御される第２制御ステップと、  A second control step in which the first light receiving means is controlled to respond to light;
前記第２制御ステップの後のステップであり、前記光出力手段から光が出力された状態で、前記第１受光手段からの信号と前記第２受光手段からの信号との差分の信号を前記第３記憶ステップで記憶された信号で補正する補正ステップと、  A step after the second control step, and in a state where light is output from the light output means, a signal of a difference between a signal from the first light receiving means and a signal from the second light receiving means is A correction step for correcting with the signal stored in the three storage steps;
前記補正ステップで補正された信号から前記被測定体の情報を生成する情報生成ステップと、  An information generating step for generating information on the measured object from the signal corrected in the correcting step;
を有する測定方法。  Measuring method.
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